onefastrx7

Hi guys, is it possible to run more than 4 injectors on the LTX8? Do I need the LT12?
Is it going to let me run 2x550cc, 2x880cc, and then 2x1600cc in stages?
Need enough fuel for 600rwhp...

10sec rx7

to run that you will need a LT12s

just put 1000's or 1600's in the primarys and secondarys, i have done a few setups like that and they work fine

Dale

onefastrx7

Thanks Dale!

But if I run 2x1600cc for primaries and 2x1680cc for secomdaries, how is the car going to idle? Driveability? Cruising?

Is teh Microtech good enough to tune out the huge 1600cc primaries?

10sec rx7

i have tuned a few mazdas with 1600cc primarys and they drive and idle fine, you just have to spend the time getting it right, yes the microtech will run it fine,

you can run 4 secondary injectors but you will need 1000cc or 1200cc primarys,

1200cc primarys
4x1000cc secondarys would be plenty

Dale

onefastrx7

So how easy is to tune the idle with the 1000cc primaries? Is it done just by tuning the idle fuel map and %stage?

patman

iTrader: (3)

why not run smaller primaries, and just lower the stage point?

onefastrx7

Right now I am running 550cc primaries and 1600cc secondaries. %stage is 95%, stage rpm is 3000rpms, and stage load is 0 psi.
It is still difficult to do the transition. The Load map runs values of about 2ms up to 3K rpms, and then after that I dropped the values to 1.xx ms, and then increasing them. Same for the wot fuel map. I am lowering the % a little bit at 0psi.

Am I doing something wrong?
Should I just tune the load map, and leave the wot alone?
Before I was running 550cc and 1000cc, and the car was running flawless. %stage was at 60%, rpm was at 3000, and load was at 05".
Now, since the fuel volume changed, I multiplied the values in the load map under 3K rpms by 0.82 ( 60 divided by 95), and I multiplied the values at and above 3K rpms by 0.72 ( total fuel flow before was 3100cc (2x550 + 2x1000), divided by flow now at 4300cc (2x550 + 2x1600)).



Does this method sound right? Should I just tune the load map, and not mess with the WOT map? Should I turn the stage load OFF?

patman

iTrader: (3)

use matrix mode.

TT_Rex_7

Can you run 2 850cc prim., and 4 1600cc sec. with the LT10S?!

-Alex

patman

iTrader: (3)

you can run as many injectors as you want with any ecu. with the lt8, you can only run 2 stages, primary and secondary, for two rotors. you can run 2 primary and 4 secondary or whatever, thats no problem.

pat

patman

iTrader: (3)

what the **** are you running with 4 1600s anyway? a rolling gas station?

onefastrx7

So I should just set the %stage at about 95-99, rpm stage at 3000 or 3500, and the map stage at 0 or 2psi. Then just mess with the 3D matrix mode on the fuel? Idle and lower load points and lower rpm points?

Thanks for the HELP guys!!!

TT_Rex_7

Twin GT3071R's! 2 850cc prim. injectors and 4 1000cc sec. injectors wouldn't provide enough fuel without maxing them out, so I went with 4 1600cc sec. injectors. Now I don't ever have to worry about even coming close to maxing them out! I'm just waiting on the LT10S to show up. I got it from the group buy that is going on.

-Alex

Crusader_9x

Can you not wire up two injectors in series or parrallel on the same driver? Like on the same set of wires just y them off to another injector?

1sgen

iTrader: (1)

yes you can wire up to 4 injectors on the same driver depending on the resistance

onefastrx7

Wow! Trying to hit 800-1000hp?

So how exactly are you doing the staging of the current setup ( 2x850 and 4x1000)?